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<title>RandomTrackSelection (ExoPlayer library)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">com.google.android.exoplayer2.trackselection</a></div>
<h2 title="Class RandomTrackSelection" class="title">Class RandomTrackSelection</h2>
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<li><a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">java.lang.Object</a></li>
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<li><a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">com.google.android.exoplayer2.trackselection.BaseTrackSelection</a></li>
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<li>com.google.android.exoplayer2.trackselection.RandomTrackSelection</li>
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<dt>All Implemented Interfaces:</dt>
<dd><code><a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></code>, <code><a href="TrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">TrackSelection</a></code></dd>
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<pre>public final class <span class="typeNameLabel">RandomTrackSelection</span>
extends <a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></pre>
<div class="block">An <a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection"><code>ExoTrackSelection</code></a> whose selected track is updated randomly.</div>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="RandomTrackSelection.Factory.html" title="class in com.google.android.exoplayer2.trackselection">RandomTrackSelection.Factory</a></span></code></th>
<td class="colLast">
<div class="block">Factory for <a href="RandomTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection"><code>RandomTrackSelection</code></a> instances.</div>
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<h3>Nested classes/interfaces inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></h3>
<code><a href="ExoTrackSelection.Definition.html" title="class in com.google.android.exoplayer2.trackselection">ExoTrackSelection.Definition</a></code></li>
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<h3>Fields inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></h3>
<code><a href="BaseTrackSelection.html#group">group</a>, <a href="BaseTrackSelection.html#length">length</a>, <a href="BaseTrackSelection.html#tracks">tracks</a></code></li>
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<h3>Fields inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="TrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">TrackSelection</a></h3>
<code><a href="TrackSelection.html#TYPE_CUSTOM_BASE">TYPE_CUSTOM_BASE</a>, <a href="TrackSelection.html#TYPE_UNSET">TYPE_UNSET</a></code></li>
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<th class="colFirst" scope="col">Constructor</th>
<th class="colLast" scope="col">Description</th>
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<tr class="altColor">
<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E(com.google.android.exoplayer2.source.TrackGroup,int%5B%5D,int,java.util.Random)">RandomTrackSelection</a></span>&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
                    int[]&nbsp;tracks,
                    int&nbsp;type,
                    <a href="https://developer.android.com/reference/java/util/Random.html" title="class or interface in java.util" class="externalLink" target="_top">Random</a>&nbsp;random)</code></th>
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<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectedIndex()">getSelectedIndex</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the index of the selected track.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectionData()">getSelectionData</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns optional data associated with the current track selection.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSelectionReason()">getSelectionReason</a></span>()</code></th>
<td class="colLast">
<div class="block">Returns the reason for the current track selection.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>void</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)">updateSelectedTrack</a></span>&#8203;(long&nbsp;playbackPositionUs,
                   long&nbsp;bufferedDurationUs,
                   long&nbsp;availableDurationUs,
                   <a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue,
                   <a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk">MediaChunkIterator</a>[]&nbsp;mediaChunkIterators)</code></th>
<td class="colLast">
<div class="block">Updates the selected track for sources that load media in discrete <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s.</div>
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<h3>Methods inherited from class&nbsp;com.google.android.exoplayer2.trackselection.<a href="BaseTrackSelection.html" title="class in com.google.android.exoplayer2.trackselection">BaseTrackSelection</a></h3>
<code><a href="BaseTrackSelection.html#blacklist(int,long)">blacklist</a>, <a href="BaseTrackSelection.html#disable()">disable</a>, <a href="BaseTrackSelection.html#enable()">enable</a>, <a href="BaseTrackSelection.html#equals(java.lang.Object)">equals</a>, <a href="BaseTrackSelection.html#evaluateQueueSize(long,java.util.List)">evaluateQueueSize</a>, <a href="BaseTrackSelection.html#getFormat(int)">getFormat</a>, <a href="BaseTrackSelection.html#getIndexInTrackGroup(int)">getIndexInTrackGroup</a>, <a href="BaseTrackSelection.html#getSelectedFormat()">getSelectedFormat</a>, <a href="BaseTrackSelection.html#getSelectedIndexInTrackGroup()">getSelectedIndexInTrackGroup</a>, <a href="BaseTrackSelection.html#getTrackGroup()">getTrackGroup</a>, <a href="BaseTrackSelection.html#getType()">getType</a>, <a href="BaseTrackSelection.html#hashCode()">hashCode</a>, <a href="BaseTrackSelection.html#indexOf(int)">indexOf</a>, <a href="BaseTrackSelection.html#indexOf(com.google.android.exoplayer2.Format)">indexOf</a>, <a href="BaseTrackSelection.html#isBlacklisted(int,long)">isBlacklisted</a>, <a href="BaseTrackSelection.html#length()">length</a>, <a href="BaseTrackSelection.html#onPlaybackSpeed(float)">onPlaybackSpeed</a></code></li>
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<h3>Methods inherited from interface&nbsp;com.google.android.exoplayer2.trackselection.<a href="ExoTrackSelection.html" title="interface in com.google.android.exoplayer2.trackselection">ExoTrackSelection</a></h3>
<code><a href="ExoTrackSelection.html#onDiscontinuity()">onDiscontinuity</a>, <a href="ExoTrackSelection.html#onPlayWhenReadyChanged(boolean)">onPlayWhenReadyChanged</a>, <a href="ExoTrackSelection.html#onRebuffer()">onRebuffer</a>, <a href="ExoTrackSelection.html#shouldCancelChunkLoad(long,com.google.android.exoplayer2.source.chunk.Chunk,java.util.List)">shouldCancelChunkLoad</a></code></li>
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<h4>RandomTrackSelection</h4>
<pre>public&nbsp;RandomTrackSelection&#8203;(<a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source">TrackGroup</a>&nbsp;group,
                            int[]&nbsp;tracks,
                            int&nbsp;type,
                            <a href="https://developer.android.com/reference/java/util/Random.html" title="class or interface in java.util" class="externalLink" target="_top">Random</a>&nbsp;random)</pre>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>group</code> - The <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>. Must not be null.</dd>
<dd><code>tracks</code> - The indices of the selected tracks within the <a href="../source/TrackGroup.html" title="class in com.google.android.exoplayer2.source"><code>TrackGroup</code></a>. Must not be
     null or empty. May be in any order.</dd>
<dd><code>random</code> - A source of random numbers.</dd>
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<h4>updateSelectedTrack</h4>
<pre class="methodSignature">public&nbsp;void&nbsp;updateSelectedTrack&#8203;(long&nbsp;playbackPositionUs,
                                long&nbsp;bufferedDurationUs,
                                long&nbsp;availableDurationUs,
                                <a href="https://developer.android.com/reference/java/util/List.html" title="class or interface in java.util" class="externalLink">List</a>&lt;? extends <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk" target="_top">MediaChunk</a>&gt;&nbsp;queue,
                                <a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk">MediaChunkIterator</a>[]&nbsp;mediaChunkIterators)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#updateSelectedTrack(long,long,long,java.util.List,com.google.android.exoplayer2.source.chunk.MediaChunkIterator%5B%5D)">ExoTrackSelection</a></code></span></div>
<div class="block">Updates the selected track for sources that load media in discrete <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s.

 <p>This method will only be called when the selection is enabled.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>playbackPositionUs</code> - The current playback position in microseconds. If playback of the
     period to which this track selection belongs has not yet started, the value will be the
     starting position in the period minus the duration of any media in previous periods still
     to be played.</dd>
<dd><code>bufferedDurationUs</code> - The duration of media currently buffered from the current playback
     position, in microseconds. Note that the next load position can be calculated as <code>
     (playbackPositionUs + bufferedDurationUs)</code>.</dd>
<dd><code>availableDurationUs</code> - The duration of media available for buffering from the current
     playback position, in microseconds, or <a href="../C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a> if media can be buffered to the
     end of the current period. Note that if not set to <a href="../C.html#TIME_UNSET"><code>C.TIME_UNSET</code></a>, the position up to
     which media is available for buffering can be calculated as <code>(playbackPositionUs +
     availableDurationUs)</code>.</dd>
<dd><code>queue</code> - The queue of already buffered <a href="../source/chunk/MediaChunk.html" title="class in com.google.android.exoplayer2.source.chunk"><code>MediaChunk</code></a>s. Must not be modified.</dd>
<dd><code>mediaChunkIterators</code> - An array of <a href="../source/chunk/MediaChunkIterator.html" title="interface in com.google.android.exoplayer2.source.chunk"><code>MediaChunkIterator</code></a>s providing information about
     the sequence of upcoming media chunks for each track in the selection. All iterators start
     from the media chunk which will be loaded next if the respective track is selected. Note
     that this information may not be available for all tracks, and so some iterators may be
     empty.</dd>
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<h4>getSelectedIndex</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;getSelectedIndex()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectedIndex()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns the index of the selected track.</div>
</li>
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<h4>getSelectionReason</h4>
<pre class="methodSignature">public&nbsp;int&nbsp;getSelectionReason()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectionReason()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns the reason for the current track selection.</div>
</li>
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<a id="getSelectionData()">
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<h4>getSelectionData</h4>
<pre class="methodSignature">@Nullable
public&nbsp;<a href="https://developer.android.com/reference/java/lang/Object.html" title="class or interface in java.lang" class="externalLink" target="_top">Object</a>&nbsp;getSelectionData()</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from interface:&nbsp;<code><a href="ExoTrackSelection.html#getSelectionData()">ExoTrackSelection</a></code></span></div>
<div class="block">Returns optional data associated with the current track selection.</div>
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